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首页> 外文期刊>Catalysis Communications >Characterisations of Pd-Ag/Al_2O_3 catalysts for selective acetylene hydrogenation: effect of pretreatment with NO and N_2O
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Characterisations of Pd-Ag/Al_2O_3 catalysts for selective acetylene hydrogenation: effect of pretreatment with NO and N_2O

机译：用于选择性乙炔加氢的Pd-Ag / Al_2O_3催化剂的表征：NO和N_2O预处理的效果

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This contribution concerns the surface characterisation of the Pd-Ag/Al_2O_3 catalyst for the selective hydrogenation of acetylene. It is shown that, by means of the temperature programmed reduction (TPR) and temperature programmed desorption (TPD), it is possible to view the surface Pd sites of the catalyst prior to pretreatment with NO or N_2O, as well as seeing the effect of Ag addition. It is shown that hydrogen adsorption on the palladium is effectively inhibited by the presence of Ag. The role of pretreatment on the activity and ethylene gain enhancement reported in our previous communication is investigated by employing transmission infrared spectroscopy.Strong adsorption of nitrate or nitrite species on Pd surface was observed from NO and N_2O pretreatment, resulting in the blockage of Pd sites responsible for direct ethane formation.Accordingly,higher ethylene gain from NO_x-treated catalysts was seen over the untreated catalyst.
机译：该贡献涉及用于乙炔的选择性氢化的Pd-Ag / Al_2O_3催化剂的表面表征。结果表明，借助程序升温还原（TPR）和程序升温脱附（TPD），可以在用NO或N_2O进行预处理之前查看催化剂的表面Pd位点，并观察到银加成。已经表明，Ag的存在有效地抑制了氢在钯上的吸附。通过透射红外光谱研究了我们在先前通报中报道的预处理对活性和乙烯增益增强的作用。从NO和N_2O预处理中观察到硝酸盐或亚硝酸盐物种在Pd表面上的强烈吸附，导致Pd位点被堵塞因此，与未处理的催化剂相比，NO_x处理的催化剂具有更高的乙烯收率。

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